32 SAPINDACEAE— ACERACEAE— JUGLANDACEAE 



Staphylea — Bladdernut 



(Gr. staphyle, a bunch of grapes) 

 Leaves pinnately trifoliate ; flowers white S. trifolia 



Sapindaceae — Soapberry Family 

 ["rees or shrubs, with alternate, sometimes opposite, compound leaves; sepals 4-5, petals 3-5, 

 ions 5-10. rarely numerous, ovary 2-4-celled ; flowers syncarpous, apopetalous, hypogynous, dioe- 

 cious or polygamous, mostly irregular. 



Aesculus — Horse Chestnut, Buckeye 



(The Latin name) 



1. Flowers white, yellow or purple-spotted; leaflets sharply acuminate A. hippocdstanum 



2. Flowers yellow; leaflets acuminate; bark fetid A. glabra 



Aceraceae — Maple Family 

 Trees or large shrubs with opposite lobed or compound leaves ; sepals 5, petals 5 or 0, stamens 

 usually 5 or 8. ovary 2-celled, fruit a pair of winged pistils; flower syncarpous, apopetalous or 

 apetalous. perigyiious, dioecious or polygamous, usually regular. 



Acer — Maple 



(Li. acer, maple tree) 

 PI. 12, fig. A ; fig. B : 1, 2 



1. Leaves simple 



a. Shrubs; flowers in racemes or narrow panicles; native A.spicdtum 



b. Trees ; flowers in panicles, corymbs, or umbel-like clusters ; native 



and cultivated 



(1) Leaves pinnately veined, irregularly serrate; flowers in terminal 



panicles A. tataricum 



(2) Leaves palmately lobed ; lobes coarsely dentate-serrate or cut, or 



almost entire : flowers in corymbs or umbel-like clusters 



(a) Flowers greenish, appearing with the leaves 



x. Flowers in erect, flat-topped panicles : wings of fruit long, 



spreading A. platanoides 



y. Flowers in pendant, umbel-like clusters, long-pedicelled ; wings 

 of fruit short, not spreading 

 (x) Leaves with shallow lobing ; sinus at the base closed; 



petioles and veins beneath pubescent A. nigrum 



(y) Leaves with deeper lobing ; sinus at the base shallow or 



none; petioles glabrous A.saccharum 



(b) Flowers red or yellowish red, appearing from separate buds 



before the leaves 

 x. Flowers yellowish red ; leaves deeply 5-lobed ; lobes narrow 



at the base A. saccharinum 



y. Flowers brilliant red ; kaves about 3-lobed ; lobes not narrow 



at the base A. rubrum 



2. Leaves compound; flowers strictly dioecious A. ncgundo 



Anacardiaceae — Sumac Family 

 Trees, shrubs or woody vines, usually with comportnd alternate leaves; sepals 3-7, usually 5, 

 petals 3-7 or 0, stamens 3-7, ovary 1-celled. style- 1-3: flower syncarpous, apopetalous, perigynous, 

 regular. . 



Rhus — Poison Ivy 



(Gr. rhous, sumac) 

 Low shrub or tall vine, with glossy trifoliate leaves ; poisonous R. radicans 



Juglandaceae — Walnut Family 

 Trees with alternate odd-pinnate leaves; flowers monoecious, the staminate in catkins; stamin- 

 ate flower with sepals 3-6 or 0, petals 0, stamens 3-many; pistillate flower, sepals 3-5, petals 4 or 0, 

 ovary 1-celled. styles 2; flowers syncarpous, apopetalous or apetalous. epigynous, regular. 



I. Staminate catkins sessile, solitarj or grouped; outer leaflets smaller 



than the middle ones Juglans 



II. Staminate catkins in groups of three with a common stalk; outer leaflets 



at least as large as the others Carya 



